| 摘要 |
The present invention relates to photostable sunscreen compositions comprising sunscreens, more particularly to liquid compositions in emulsion or microemulsion format comprising a dibenzoylmethane sunscreen or a derivative thereof. An object of the present invention is to provide photostable compositions comprising dibenzoylmethane sunscreens or a derivative thereof, wherein the stabilization is brought about by using readily available and inexpensive ingredients. The present inventors have surprisingly found that cosmetic compositions comprising dibenzoylmethane or a derivative thereof can be stabilized in a specific liquid emulsion or microemulsion formulation having specified ingredients in selective amounts, namely: a. 0.1 to 10% by weight dibenzoylmethane or its derivative; b. 10 to 40% by weight an emulsifier; c. 5 to 40% by weight a co-emulsifier selected from the group consisting of C2 to C8 straight or branched chain alcohol, polyhydric alcohol and C5 to C8 low molecular weight fatty acid; d. 10 to 60% by weight a hydrophobic liquid having a log P value at 25°C greater than 3 and a water solubility at 25°C less than 0.1% by weight; and e. 10 to 50% by weight water. |
